Cyclic-Structured Ionic Liquids Enable Highly Stable and Efficient Ambient-Air-Processed Perovskite Solar Cells
발표자
차정범 (서울시립대학교)
연구책임자
김민 (서울시립대학교)
공동저자
차정범 (서울시립대학교), 김민 (서울시립대학교), 진해담 (서울시립대학교)
초록
내용
Perovskite solar cells (PSCs) have achieved power conversion efficiency (PCE) over 26% but remain reliant on inert gas condition and toxic anti-solvents, hampering scale-up. In this study, ambient-condition (RH <50%) fabrication of perovskite is reported using ethyl acetate modified with ring-size-tunable N-heterocyclic ammonium ionic liquids (ILs): 1-(2-ethoxyethyl)-1-methylpyrrolidinium (PYR+) and 1-(2-ethoxyethyl)-1-methylpiperidinium (PIP+). Comparative study reveals that the PYR+ cation not only enhances (100) facet orientation but also induces in-plane compressive lattice strain. In-situ GIWAXS under electrical bias and 1-sun illumination demonstrates that addition of IL prevents α to δ phase transitions under operating condition. PSC with PYR+ shows the highest PCE of 24.7% and maintains over 90% of initial PCE after 1000 h of damp-heat stress. These results suggest a strategy for ambient-processed PSCs.